Refactor cmake (#721)

* some start of refactor

* Update SetFlags.cmake

* Update SetCmakeVar.cmake

* Update SetFlags.cmake

* Fix error int-convertion

* more refactor

* clean up include and source file

* fix link of lib

* fix a warning

* fix include in src/actors

* fix include in src/debug

* fix include in src/ending

* fix include in src/engine/actors

* fix include in src/engine/cameras

* fix include in src/engine/editor

* fix include in src/engine/objects

* fix include in src/engine/tracks

* fix include in src/port/ui

* fix include in src/racing

* fix include in src/engine/vehicles

* fix include in subfolder of src/engine

* fix include in src/engine

* fix include in src/enhancements

* fix include in src

* fix switch

* invert common and findlib

* Update SetFlags.cmake

* clean up some workflow

* some splification

* Update build.sh

* Update Game.h

* add header back

* Delete test_check.cmake

* continue

* Update common.cmake

src/port/Game.cpp

@@ -17,7 +17,7 @@
 #include "engine/objects/BombKart.h"
 #include "engine/objects/Lakitu.h"
 
-#include "Smoke.h"
+#include "engine/Smoke.h"
 
 #include "engine/HM_Intro.h"
 
@@ -42,7 +42,7 @@ extern "C" {
 #include "main.h"
 #include "audio/load.h"
 #include "audio/external.h"
-#include "render_courses.h"
+#include "racing/render_courses.h"
 #include "menus.h"
 #include "update_objects.h"
 #include "spawn_players.h"